PS2502-1 Optoisolator 5KV Darlington Output

Part Overview

The PS2502-1 is a single-channel optoisolator with Darlington output rated for 5000Vrms isolation voltage in a 4-DIP package. The main part is classified as Obsolete, necessitating identification of suitable alternatives for ongoing system support and new designs. Direct manufacturer equivalents and similar-specification alternatives are available from multiple vendors to ensure design continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	PS2502-1
Manufacturer	CEL
Number of Channels	1
Voltage - Isolation	5000Vrms
Current Transfer Ratio (Min)	200% @ 1mA
Output Type	Darlington
Voltage - Output (Max)	40V
Current - Output / Channel	200mA
Operating Temperature Range	-55°C ~ 100°C
Package / Case	4-DIP (0.300", 7.62mm)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Isolation Voltage: 5000Vrms minimum required
Output Type: Darlington configuration mandatory
Number of Channels: Single channel only
Package Type: 4-DIP (0.300", 7.62mm) through-hole mounting
Current Transfer Ratio (Min): 200% @ 1mA minimum acceptable
Maximum Output Voltage: 40V or higher
Maximum Output Current: 200mA or higher
Operating Temperature Range: Must accommodate -55°C ~ 100°C or equivalent

Substitute parts are grouped into three categories:

Direct Manufacturer Equivalent: PS2502-1-A (Renesas Electronics Corporation) - Identical specifications with improved RoHS3 compliance
Parametric Equivalents: PS2562-1-A and PS2562-1-V-A (Renesas Electronics Corporation) - Meet all critical parameters with identical electrical performance
Similar Alternative: LTV-815 (Lite-On Inc.) and SFH619A (Vishay Semiconductor Opto Division) - Alternative suppliers with comparable isolation and output characteristics

Parameter Comparison

Parameter	PS2502-1	PS2502-1-A	PS2562-1-A	PS2562-1-V-A	LTV-815	SFH619A
Manufacturer	CEL	Renesas	Renesas	Renesas	Lite-On Inc.	Vishay
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5300Vrms
Current Transfer Ratio (Min)	200% @ 1mA	200% @ 1mA	200% @ 1mA	200% @ 1mA	600% @ 1mA	1000% @ 1mA
Number of Channels	1	1	1	1	1	1
Output Type	Darlington	Darlington	Darlington	Darlington	Darlington	Darlington
Voltage - Output (Max)	40V	40V	40V	40V	35V	300V
Current - Output / Channel	200mA	200mA	200mA	200mA	80mA	125mA
Voltage - Forward (Vf) (Typ)	1.17V	1.17V	1.17V	1.17V	1.2V	1.2V
Vce Saturation (Max)	1V	1V	1V	1V	1V	1.2V
Operating Temperature Range	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-30°C ~ 100°C	-55°C ~ 100°C
Package / Case	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)
Product Status	Obsolete	Not For New Designs	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Design Continuity (Like-for-Like Replacement): PS2502-1-A is the direct equivalent providing identical electrical characteristics. This part is classified as "Not For New Designs" but remains suitable for legacy system support and board-level replacement scenarios. The transition to ROHS3 compliance improves environmental qualification over the original obsolete part.

For New Designs with Active Support: PS2562-1-A and PS2562-1-V-A offer parametric equivalence with identical isolation voltage, current transfer ratio, and output specifications. Both are classified as Active products, ensuring long-term availability and manufacturer support. These parts are recommended for new system development requiring the PS2502-1 electrical interface.

For Enhanced Performance Alternatives: LTV-815 (Lite-On Inc.) provides active product status with higher current transfer ratio (600% minimum) and faster switching characteristics (60µs rise time, 53µs fall time). The lower maximum output current (80mA) requires circuit review for compliance with 200mA design margins.

SFH619A (Vishay Semiconductor Opto Division) offers the highest isolation voltage rating (5300Vrms) and current transfer ratio (1000% minimum) with significantly faster switching performance (3.5µs rise time, 14.5µs fall time). The elevated maximum output voltage (300V) and vce saturation specification (1.2V) require circuit compatibility assessment.

Frequently Asked Questions (FAQ)

Q: Can PS2502-1-A replace PS2502-1 directly? A: Yes. PS2502-1-A provides electrical equivalence across all specified parameters: 5000Vrms isolation, 200% minimum current transfer ratio, 40V maximum output voltage, and 200mA output current capacity. Pin-to-pin compatibility and package dimensions (4-DIP 0.300") enable direct substitution on PCBs without design modification.

Q: What are the key differences between PS2562-1-A and the original PS2502-1? A: PS2562-1-A is parametrically equivalent with identical isolation voltage, current transfer ratio, output voltage, and output current specifications. The primary difference is part number designation within the Renesas NEPOC series. Both parts meet the same electrical requirements for applications requiring 5000Vrms isolation and 200mA output current.

Q: Why do LTV-815 and SFH619A have different output current ratings? A: LTV-815 specifies 80mA maximum output current per channel, while SFH619A specifies 125mA. The PS2502-1 specification is 200mA. Applications requiring output currents above the LTV-815 or SFH619A limits cannot use these alternatives without circuit modification. Designs with output current requirements below 80mA allow LTV-815 substitution.

Q: Are all substitute parts RoHS3 compliant? A: PS2502-1-A, PS2562-1-A, PS2562-1-V-A, LTV-815, and SFH619A are all classified as ROHS3 Compliant. The original PS2502-1 is RoHS non-compliant. Systems requiring RoHS compliance must transition to equivalent or substitute parts.

Q: Can SFH619A be used in applications requiring 40V maximum output voltage? A: SFH619A specifies 300V maximum output voltage, which exceeds the PS2502-1 specification of 40V. This higher rating creates no compatibility constraint; the part operates within the 40V design ceiling. The elevated vce saturation specification (1.2V versus 1V) requires circuit-level voltage margin review in applications with tight operating point tolerances.

Q: What is the operating temperature range constraint for LTV-815? A: LTV-815 specifies -30°C ~ 100°C operating range, compared to PS2502-1 specification of -55°C ~ 100°C. Applications requiring operation below -30°C cannot use LTV-815. All other substitutes (PS2502-1-A, PS2562-1-A, PS2562-1-V-A, SFH619A) support the full -55°C ~ 100°C range.

Q: Are switching speed differences between substitutes significant? A: Rise and fall times vary among substitute parts. PS2502-1, PS2502-1-A, PS2562-1-A, and PS2562-1-V-A specify 100µs rise and fall times. LTV-815 specifies 60µs rise and 53µs fall time. SFH619A specifies 3.5µs rise and 14.5µs fall time. Applications with switching frequency or timing constraints above 100kHz require performance validation with faster alternatives.

Q: Can multiple substitutes be used interchangeably in the same circuit board? A: All six parts maintain identical package footprint (4-DIP 0.300", 7.62mm) and pinout for direct PCB substitution. However, circuit designs should account for differences in output current capability (LTV-815 at 80mA, SFH619A at 125mA, others at 200mA), switching performance, and operating temperature range when mixing part numbers across board lots or production runs.

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